Intel (INTC) stock fell 6% Wednesday, ending a massive upswing in which shares notched their biggest five-day gain in Intel's history as a publicly traded company. The decline came as analysts expressed skepticism over recent reports of potential deals with TSMC (TSM) and Broadcom (AVGO) to break up the storied US chipmaker.

Intel gained but a potential split of the company’s operations between Taiwan Semiconductor Manufacturing and Broadcom faces major hurdles.

Broadcom reportedly has some interest in Intel’s design business. But one analyst says “a lot seems like it needs to happen” for a deal to become reality.